OOO This is a tricky one. I have had a similar issue myself. I don't think its necessairily grounds for getting rid of the child but not to say this hasn't entered my mind before when I have been presented with the same senario. I'd be inclined to try and transition him back in slightly differently. Make a point of enphasising the quiet calm setting. Depending on the childs age maybe the day he comes back have him sit back with you playing one on one quietly and observe the other children playing calmly with him and talk to him about how this is a much more appropriate way of playing. I know this might not work as it totally depends on the boys age and level of communication and understanding, but maybe trying to break his habit of "rowdy" play means not letting him come back full force in to the group without support. This would be the ideal opportunity to make these changes if possible after he has had a break from the group.

In additon, speak to his parents, even if you give them a courtousy call before he returns to care. Just give them the heads up that while he is a great kid, while he was away you feel the group has been much calmer and you would like to reintroduce him in to the group by teaching him to play more in this manner. Hopefully you will get their support and they may implement this calmer play at home to reinforce this.

If you try this it may work, but if not then as I have done in the past I suggest to parents that the needs of their child have changed and that I feel they would be better suited to a larger setting, say in a daycare centre versus a more intimate home daycare setting. That way you aren't saying that theres anything wrong with the childs behaviour only that the dynamics of your group no longer fit his needs. I have had to tell a couple of parents this for boys but never for girls so far.

Good Luck